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Calling open() on input devices can generate device I/O which blocks the main thread and causes dropped frames. Using stat() we can avoid opening anything unless /dev/input has changed since we last polled. We could have used something fancy like inotify, but it didn't seem worth the added complexity for this uncommon non-udev case.
Simple DirectMedia Layer
(SDL)
Version 2.0
---
https://www.libsdl.org/
Simple DirectMedia Layer is a cross-platform development library designed
to provide low level access to audio, keyboard, mouse, joystick, and graphics
hardware via OpenGL and Direct3D. It is used by video playback software,
emulators, and popular games including Valve's award winning catalog
and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting
with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)
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